Simplify |2t^2- square root of 81| - Math help

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$| 2 t^{2} - \sqrt{81} |$

Rewrite $81$ as $9^{2}$ .

$| 2 t^{2} - \sqrt{9^{2}} |$

Pull terms out from under the radical, assuming positive real numbers.

$| 2 t^{2} - 1 \cdot 9 |$

Multiply $- 1$ by $9$ .

$| 2 t^{2} - 9 |$

Simplify |2t^2- square root of 81|

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